An Aggregation-Induced Phosphorescence-Active "Turn-Off" Nanosensor Based on Ferric-Specific Quenching of Luminescent and Water-Soluble Au(I)-Cysteine Nanocomplexes
- 5 May 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 92 (9), 6785-6791
- https://doi.org/10.1021/acs.analchem.0c01358
Abstract
Recently, aggregation-induced emission (ME) has attracted extensive attention. Herein we report an AIP-active "turnoff' nanosensor based on ferric-specific quenching of photoluminescence (PL) of water-soluble Au(I)-cysteine nanocomplexes. The Au(I)-cysteine nanocomplexes were AIP-active, showing a PL peak at 590 nm. Transmission electron microscopy (TEM) characterization revealed that they show the characteristic morphology of nanofibers. High-speed centrifugation characterization and zeta potential measurement indicated that they are highly water-soluble. Interestingly, their PL could be quenched specifically by ferric ions over the other common 18 metal ions. Further TEM characterizations revealed that the quenching process was accompanied by the ferric-specific dissociation of Au(I)-cysteine nanofibers. These observations have enabled the development of a water-soluble MP-active "turn-off' nanosensor based on Au(I) nanocomplexes for selective and sensitive detection of ferric ions. This study indicates that specific quenching and disassociation of AIP-active nanocomplexes might be a promising route for development of novel luminescent nanosensors.Funding Information
- Ministry of Education of the People's Republic of China (FRF-BD-18-001B)
- Beijing Municipal Science and Technology Commission (z131102002813058)
- National Natural Science Foundation of China (21727815, 21890740, 21890742, 91954001)
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